Paint brush



FIG. 1 is a top plan view of a paint brush showing my new design;

FIG. 2 is a bottom plan view;

FIG. 3 is a right elevation view;

FIG. 4 is a front elevation view; and,

FIG. 5 is a rear elevation view of a paint brush.

The continuous broken line immediately adjacent the surface shading in FIG. 5 represents the bounds of the claim and the broken line structure within that boundary illustrates a portion of the article neither of which form part of the claimed design. 

The ornamental design for a paint brush, as shown and described. 